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Black steel compound gauge with ammonia scale 30 to 150 psi

Value Brand

Value Brand Compound Gauge Ammonia 3 1/2 In 150 Psi

SKU CH-3W9Q-CEV8T

Compound gauge for ammonia refrigerant reads vacuum to 150 psi with a steel case

  • TypeElectronic
  • Measures ammonia refrigerant pressure up to 150 psi
  • Compound scale reads vacuum to positive pressure in one gauge
  • Steel case with black finish resists corrosion in harsh environments
  • Bottom 1/4 in MNPT connection suits standard panel installations
  • Accuracy rated at +/-3-2-3 percent for reliable system diagnostics

Ammonia Compound Gauge

This 3 1/2 inch compound gauge is built for ammonia refrigerant systems and displays pressure from 30 inHg vacuum up to 150 psi. It suits technicians who need a single instrument for both evacuation and charging tasks on industrial or commercial refrigeration equipment.

Steel Case and Dry Operation

The black steel case resists corrosion in harsh plant environments and the gauge is not liquid filled, so there is no fill fluid to leak or freeze during normal service. Accuracy follows a 3-2-3 percent grade across the scale, giving reliable readings without the thermal lag that filled gauges can introduce.

Bottom Mount With 1/4 NPT Connection

A 1/4 inch male NPT bottom connection threads directly into standard service ports or manifold blocks, and the gauge is not panel mountable, so it stays inline where the technician can read it easily. No calibration certificate is included, so shops that require documented traceability will need to arrange certification separately.

Highlights

  • Measures ammonia refrigerant pressure up to 150 psi
  • Compound scale reads vacuum to positive pressure in one gauge
  • Steel case with black finish resists corrosion in harsh environments
  • Bottom 1/4 in MNPT connection suits standard panel installations
  • Accuracy rated at +/-3-2-3 percent for reliable system diagnostics

Specifications

BrandZoro Select
TypeElectronic

Questions about this item

How do I install the 1/4 in MNPT bottom connection, and what step is often missed?

Thread the 1/4 in MNPT fitting into the bottom port using pipe sealant on the threads; the step often missed is tightening with a wrench on the steel case flats only, never on the gauge face, to avoid cracking the case.

What maintenance or replacement will this ammonia compound gauge need over time?

The steel case and non-liquid-filled design require periodic leak checks at the 1/4 in MNPT connection; if the needle drifts beyond the +/-3-2-3 percent accuracy spec, the gauge must be replaced as no calibration certificate is included.

What limit appears first when this gauge is used continuously at the 150 psi upper range?

Sustained pressure at 150 psi stresses the bourdon tube first; the +/-3-2-3 percent accuracy band is the practical limit before readings become unreliable for ammonia refrigerant monitoring.

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